Siemens 3TF6844-0CM7 AC Contactor 250A – SIRIUS Innovation 3TF6 Series
In high-demand industrial environments — motor control centers, heavy-duty pump stations, compressor drives, and large HVAC systems — a failed contactor can bring an entire production line to a standstill. Unplanned downtime in these settings costs thousands of dollars per hour. The Siemens 3TF6844-0CM7 is engineered precisely to prevent such failures: a robust, high-current AC contactor rated for demanding switching cycles, built to the exacting standards of Siemens SIRIUS technology.
The 3TF6844-0CM7 occupies the upper tier of the SIRIUS Innovation 3TF6 contactor family — a series globally recognized for its reliability in motor switching applications up to 250A. With decades of proven field performance across European, Asian, and North American industrial installations, the 3TF6 series remains a benchmark for heavy-duty contactors in the global automation market. The -0CM7 suffix designates a specific coil voltage configuration, making this variant a precise fit for targeted control circuit requirements.
Technical Specifications
- Part Number / SKU: 3TF6844-0CM7
- Brand: Siemens
- Series: SIRIUS Innovation 3TF6
- Product Type: AC Contactor
- Rated Current: 250A (AC-3 duty)
- Coil Voltage: Per -0CM7 designation (verify with datasheet for exact voltage)
- Pole Configuration: 3-pole main contacts
- Auxiliary Contacts: 4 NO + 4 NC (integrated)
- Mounting: DIN rail / screw mounting
- Weight: Approx. 1,900 g
- Standards: IEC 60947-4-1, CE, UL listed
Note: All specifications are based on Siemens official documentation. Do not rely solely on this page for engineering decisions — always verify against the current Siemens datasheet.
Key Features & Benefits
- High Switching Capacity: Rated for 250A AC-3 duty, suitable for direct-on-line motor starting of large motors.
- Integrated Auxiliary Contacts: 4 NO + 4 NC auxiliary contacts provide flexible control circuit wiring without additional add-on blocks.
- Robust Arc Quenching: Advanced arc chamber design ensures reliable interruption of high inrush currents, extending service life.
- Low Power Consumption Coil: SIRIUS Innovation coil technology reduces control circuit power draw, lowering heat generation in control panels.
- Wide Ambient Temperature Range: Designed for operation in harsh industrial environments with broad temperature tolerance.
- Modular Expandability: Compatible with Siemens SIRIUS accessory ecosystem — add-on auxiliary contact blocks, surge suppressors, and mechanical interlocks.
- Global Certifications: IEC, CE, and UL compliance supports deployment in international projects.
Industry & Equipment Applications
- Motor Control Centers (MCC): Direct-on-line and star-delta starting of large induction motors in manufacturing plants.
- Water & Wastewater Treatment: Pump station motor switching, blower control, and sludge treatment equipment.
- Oil & Gas: Compressor motor control, wellhead automation, and pipeline pumping stations.
- Mining & Minerals: Conveyor drives, crusher motor control, and ventilation fan switching.
- HVAC & Building Automation: Large chiller compressor control, cooling tower fan motors.
- Steel & Metals: Rolling mill auxiliary drives, furnace blower control.
- Marine & Offshore: Shipboard motor control panels requiring IEC-certified components.
System Integration & Compatible Parts
The Siemens 3TF6844-0CM7 is designed to integrate seamlessly within the SIRIUS automation ecosystem. Compatible and commonly paired components include:
- Overload Relays: Siemens 3RU2 / 3RB3 series thermal and electronic overload relays for motor protection.
- Circuit Breakers: Siemens 3RV2 motor protection circuit breakers for upstream protection.
- Auxiliary Contact Blocks: Siemens 3TX4 / 3TX7 add-on auxiliary contact blocks.
- Surge Suppressors: Siemens 3TX6 varistor / RC suppressor modules for coil protection.
- Mechanical Interlocks: Siemens 3TF / 3TK mechanical interlock kits for reversing contactor configurations.
- PLC Integration: Compatible with Siemens SIMATIC S7-300/400/1200/1500 digital output modules for automated control.
Our Quality Assurance Process
At Konmask.com, every Siemens component we supply undergoes a structured verification process before shipment:
- Source Verification: Parts are sourced from authorized distributors and verified supply chains to minimize counterfeit risk.
- Visual Inspection: Each unit is inspected for label authenticity, housing integrity, and correct part number marking.
- Functional Check: Where applicable, coil actuation and contact continuity are verified prior to packaging.
- Secure Packaging: Anti-static and impact-resistant packaging protects components during international transit.
- Documentation: Packing list, inspection report, and available certificates of conformity provided upon request.
How to Order
- Submit your inquiry via the Contact / RFQ form on this page or email [email protected].
- Provide your required quantity, delivery destination, and any project-specific requirements (e.g., certificates, lead time).
- Our team will respond within 1 business day with availability, pricing, and lead time confirmation.
- Upon agreement, we issue a proforma invoice and arrange shipment via your preferred logistics method (DHL, FedEx, sea freight, etc.).
- Tracking information and shipping documents are provided upon dispatch.
Minimum Order Quantity: 1 piece. Bulk and project orders welcome.
Why Choose Konmask.com?
- ✅ Specialized in Industrial Automation: Focused exclusively on PLC, DCS, drives, and control components — not a generalist marketplace.
- ✅ B2B Inquiry-Driven Service: We understand project timelines, BOM requirements, and the urgency of replacement parts.
- ✅ Global Shipping: Experienced in export documentation, customs compliance, and international logistics for industrial goods.
- ✅ Responsive Support: Technical and commercial team available to assist with cross-referencing, compatibility checks, and urgent sourcing.
- ✅ Competitive Pricing: Direct sourcing relationships enable competitive pricing for both spot buys and volume orders.
Frequently Asked Questions
- Q: Is the Siemens 3TF6844-0CM7 still in production?
- A: The 3TF6 series has been a long-standing Siemens product line. Availability may vary by region. Contact us for current stock status and lead time.
- Q: What is the coil voltage of the -0CM7 variant?
- A: The -0CM7 suffix specifies the coil voltage. Please refer to the official Siemens datasheet or contact our team for confirmation before ordering.
- Q: Can this contactor be used for reversing duty?
- A: Yes, with the appropriate Siemens mechanical interlock kit, two 3TF6844-0CM7 units can be configured for reversing motor control.
- Q: Do you provide a warranty?
- A: We provide a standard warranty against manufacturing defects. Terms are confirmed at the time of order. Contact us for details.
- Q: Can you supply the full BOM for a motor control panel?
- A: Yes. Konmask.com specializes in complete BOM sourcing for industrial control panels. Send us your parts list and we will provide a consolidated quotation.
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